Lifting jack



Oct. 29, 1929. J BARNES 1,733,480

LIFTING JACK Filed March 20. 1926 2 Sheets-Sheet 1 tea Oct, 29, 1929- J. L. BARNES LIFTING JACK Filed March 20. 1926 2 Sheets-Shah;

Patented a. 29, 1929 UNITED STATES JOHN L. BARNES, 0F WHIGVILLE, OHIO LIFTING JACK Application filed latch 20,

This invention relates to lifting 'acks and the object thereof is to provide a li ting jack embodying a single throw lever of novel construction.

A further object thereof is to provide a jack of the character described embracing a vertically adjustable lever whereby the height {0 wihich the rack bar is moved may be reguate A still further object thereof is to provide a jack of the character described embodying certain novel features to be brou ht out more clearly in the following speci cation, and which is simple in construction, efficient in operation, and inexpensive to manufacture.

In the drawings Figure 1, is a side elevational View of my invention;

Figure 2, is a front elevational view thereof;

Figure 3, is a vertical sectional view thereof; and,

Fi re 4, is a detail elevational view of the rack arused in connecting with my inven- 2 tion.

Referring to the drawings wherein is shown a preferred form of my invention, the numeral 1 indicates a frame wherein is mounted a rack bar 2 havin a head 3 formed at the upper end thereof an carryin a roller 4 mounted in the lower end, said rol er being adapted to bear against the interior of the frame. 1 when the bar 2 moves. The bar 2 carries an inte al laterall extendin der 5 adjacent its lower end said shou der being adapted to operate within a slot 6 in the frame 1 and havlng its movement limited by the extent of slot 6. A second roller 7 is mounted adjacent the upper end of the frame 1 and is adapted to bear against the rack bar 2' whereby movement of the same is facilitated.

Formed in the bar 2 and near the lower end thereof is a rack 8 which, when the bar is raised,-(by means to be described later) is adapted to be engaged by one end of a member 9 pivoted to the ame 1 as indicated at 10 and havinga s rin portion 11 inte al with its lower end W cm .y the member 9 is kept in engagement with rack 8 until such time as shoulably mounted 1926. Serial No. 96,247.

bar 1 which is accomplished by manipulation of the handle 12 secured to the member 9 as indicated by the numeral 13.

Means are provided for raising the bar 1 comprising a segment 14 carrying pins 15 which are adapted to firmly engage the bar 1 by entering openings 16 therein whereby upon proper movement of the segment 14 the bar may be raised. The segment 14 is fixed on a pintle 17 rotatably mounted in members 18 supported on either side of said segment 14 exteriorly of ears 19 which are formed integral with the frame 1. The lower ends of the members 18 engage and are supported by racks 20 integral with the ears 19 and are kept in engagement therewith by means of fiat springs 21 carried at the upper ends of the members 18 and bearing a ainst the ears 19 as shown more clearly in igure 2. It is thus evident that segment 14 may be raised or lowered, the pint e 18 moving in slots 22 formed in ears 19, whereby the extent of throw of the rack bar 2 may be regulated. The segment 14 has a shank 23 formed integral therewith and having depressions 24 formed on either face thereof for the reception of a cam lock 25 pivotally mounted in the member 26 which receives a reduced portion 27 of a hand grip 28 whereby alever is formed said structure being separable for pzcking in a small space or a longer lever may secured b inserting a handle of the desired length 1n the outer open end.

Having described my invention, what I claim as new and desire to secure by Letters Patent, is

1. A jack of the character described comprising a frame, laterall extending ears in-v tegral therewith, a bar a apted-to reciprocate in the frame, and provided with openings,

, roller bearings carried by said frame and bar,

a segment carrying pins adapted to enter the openings in the bar, a pintle on which said segment is fixed and having the ends thereof extending through slots formed in the laterally extending ears of the frame and rotatin members arran d exteriorthe ears and lon 'tudinal y adjustable l of thereon, a handgrip etachably secured to the segment, and means for maintaining the bar in its raised position.

2. A jack of the character described com prising a frame, laterall extending ears integral therewith, a bar a apted to reciprocate in the frame, and provided with openings, roller bearings carriedby said frame and bar, a segment carrying pins adapted to enter the openings in the bar, a pintle on which said segment is fixed and having the ends thereof extending through slots formed in the late'rally extending ears of the frame and rotatably mounted in members arranged exteriorly of the ears, said members engaging racks on the ears whereby they may be adjusted longitudinally, springs urging said members into engagement with said racks, a handgrip detachably secured to the segment, and means for maintaining the bar in its raised position.

3. A jack of the character described comprising a frame, laterall extending ears integral therewith, a bar a apted to reciprocate in the frame, and provided with openings, roller bearings carried by said frame and bar, a segment carrying pins adapted to enter the openings in the bar, a pintle on which said segment is fixed and having the ends thereof extending through slots formed in the laterally extending ears of the frame and rotatably mounted in members arranged exteriorly of the ears, said members engaging racks on the ears whereby they may be adjusted longitudinally, springs urging said members into engagement with said racks, a handgrip detachably secured to the segment, means for maintaining the bar in its raised position comrising a rack formed on the lower end of the ar, a spring pressed member carried by the frame, and engaging said rack when the bar is moved upwardly, and a handle for releasing the bar from engagement with the spring pressed member.

In testimony whereof, I afiix my signature.

' JOHN 'L. BARNES, 

